[dmd-internals] 3.5x speedup in building dmd

[Walter Bright]

I see a doubling of speed, but I've only got a dual core!

Andrei Alexandrescu wrote:
> Yours is looking good too!
>
> Andrei
>
> On 06/06/2010 04:11 PM, Brad Roberts wrote:
>> See also: http://d.puremagic.com/issues/show_bug.cgi?id=4175
>>
>> I think my solution is a little more complete than yours, though I 
>> didn't do a
>> diff of your changes, just a quick visual inspection.
>>
>> On 6/6/2010 2:01 PM, Andrei Alexandrescu wrote:
>>> Running
>>>
>>> make -f linux.mak
>>>
>>> against the original makefile takes 3:27 on my machine. I tried this to
>>> speed up building by running 4 processes at once:
>>>
>>> make -f linux.mak -j 4
>>>
>>> However, there are errors because the makefile does not establish
>>> dependencies properly.
>>>
>>> The attached makefile fixes that problem. With the changed makefile, 
>>> the
>>> build time falls to 0:52 on my machine - a more than 3.5x speedup.
>>>
>>> Walter, could you please check this in? Thanks!
>>>
>>>
>>> Andrei
>>>
>>>
>>>
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>>
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